Device for use in the heat-treatment of welded pipes

摘要: 936,972. Heat-treating pipe welds; exothermic compositions. KEMWELL A.G. July 10, 1962 [July 9, 1962], No. 26346/62. Classes 72 and 82. A heat-treatment for stress-relieving the welded area of butt-welded pipes comprises locating loosely around 4 in region weld 5 two metal hoops 6 having tightening means, e.g. screws 7, engagement with such a plurality adjacent composition blocks 1, each which has embedded therein, or otherwise secured thereto, strip 2, ends 3 extend to beyond opposite faces block lie under hoops, secure by 3, firing allowing them cool situ. The may be multi-layer, at least one layer being heat-insulating composition, moulded from mouldable compositions mould; outer end sleeves material, similarly moulded, enclose sleeve. An example an is: finely divided aluminium 30 parts, oxidizing agent, nitrates, chlorates, iron oxide and/or manganese dioxide 13 refractory filler, grog, sand, furnace aggregate chamotte 42 all weight.